Citation: Ya-Nan Ye, Pei-Yuan Li, Yong-Gang Shangguan, Zhi-Sheng Fu, Qiang Zheng, Zhi-Qiang Fan. A convenient, highly-efficient method for preparation of hydroxyl-terminated isotactic poly(propylene) and functional di-block copolymer[J]. Chinese Chemical Letters, ;2014, 25(4): 596-600. doi: 10.1016/j.cclet.2014.01.001 shu

A convenient, highly-efficient method for preparation of hydroxyl-terminated isotactic poly(propylene) and functional di-block copolymer

1.
MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China

Corresponding author: Yong-Gang Shangguan, Zhi-Sheng Fu,
Received Date: 6 September 2013
Available Online: 24 December 2013
Fund Project: This work was supported by the National Natural Science Foundation of China (No. 51173157) (No. 51173157) National High-Tech R&D Program of China (No. 2012AA040305) (No. 2012AA040305)the Major State Basic Research Programs (No. 2011CB606001). (No. 2011CB606001)

Both terminated functional isotactic polypropylene (iPP) and block copolymers containing iPP segment are desirable for commercial applications. This paper provides a convenient, highly-efficient method to prepare hydroxyl-terminated isotactic polypropylene (iPP-t-OH) and functional di-block copolymer containing the iPP segment through a combination of coordination polymerization and coupling reaction. The coordination polymerization was catalyzed by TiCl₄/MgCl₂/AlEt₃ catalyst system using ZnEt₂ as chain transfer agent. Further, the Zn-terminated iPP was oxidized and subsequently hydrolyzed to provide iPP-t-OH. Soxhlet extraction and ¹³C NMR were used to calculate the isotacticity of iPP-t-OH. The degree of polymerization and the number of hydroxyl groups at the chain end of iPP-t-OH were measured by GPC and ¹H NMR. Despite the high molecular weight and heterogeneous reaction, iPP-t-OH is effectively linked with PEG-t-NCO to produce di-block copolymers. DSC analysis of the di-block copolymer shows an obvious decrease in T_m and T_c, which indicated that PEG was successfully linked to the terminal end of iPP.
- Hydroxyl-terminated isotactic,
- poly(propylene),
- Di-block copolymer,
- Functionality,
- Coupling reaction
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